Abstract
A germination model that simulates the relationship between the germination of volunteer wheat and the tillage system in winter wheat-summer crops-barley rotation, were constructed using equations. Simulations were carried out to predict the number of volunteer wheat plants (VWP) appearing in a barley field following several tillage treatments. To evaluate the suit-ability of the growth model, simulated results were compared with observed ones in different experiments. Observed and simulated results generally gave a good fit.
Simulated results indicated that the number of VWP increased in proportion to the amount of failing wheat grain when harvested with a combine and a great number of VWP persisted where rotary-till immediately after the wheat harvest followed rotaty-till in October.
According to the simulation, few VWP appeared where plow-till immediately after the wheat harvest followed rotary-till in October. Few VWP was also appeared where rotary-till in late July followed rotary-till in December. Thus, these tillage treatments effectively prevented contamination of barley grain by volunteer wheat grain.
